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I. P. WENDELL Atmospheric Oar Brake.

Patented Nov. 2 i880,

v INVENTOR,

WITNESSES:

{2% iiiifiz isflfli 3 sheets -sheet 2. I. P. WENDELL. Atmospheric Car Brake.

233,957. Patented Nov. 2, @801.

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I. P. WENDELL.

Atmospheric Gar Brake.

233,95? Patente Nov. 2,1880. 1

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ISAAC P. WENDELL, on PHILADELPHIA. rnnnsvnvevnim ATlVlOSPl-l ERIC CAR BRAKF' SPECIFICATION formin mer-Letters Patent No. 233,957, dated. November 2,1380.

' Application mada -1117,1280. (No 1nodel.)

To all whom it may concern:

Be it known that I, ISAAC 1. WE DELL, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented pew and useful Improvements in Atmospheric Car- Brakes, of which the following is a specification, reference being had to the accompanying drawings, wherein- Figure l is a perspective of aspri-ng-supported ear-pedestal and axle-box having my improvements applied thereto. Fig. 2 is a plan, partly in section, of the running-gear of a car with my llHPIOVClIlBlltS applied thereto. Fig. 3 is a detail vertical section of the aircompressing devices, and Figs. 4 and 5 are side elevations of modifications of the same.

, My invention has for jts phiecttrto utilize the vertical vibratory movement of a springsupported car body or truck, to condense air and force it into a tank or reservoir, to be then used as a motive power for operating the car-brakes, my invention being peculiarly adapted for street-railway cars.

My invention accordingly consists in the provision of a pump or compressor secured to the axle-box'orother immovable part of the car; of operating mechanism for said pump, attached to the pedestals or yielding car-body of a reservoir or tank' aflixed to the body of the car; of a. braking or operating cylinder connected to the braking-levers and operating or controlling mechanisms, whereby the brakes are forced upon the wheels by an air-pressure produced by the vertical vibratory movement of the car.

Referring to the accompanying drawings, A

represents a portion of the frame of the carbody provided with pedestals a a of the usual or any appropriate construction. B B are the axle-boxes, and U 0 the springs between said pedestals and boxes. 1) .l) are air pumps or compressors secured to the sides of the said axle-boxes, as shown, their pistons (6 having rods (1 formed with slotted ends (1 through which passes a pin or bar connecting said rods to the levers E. The latter are pivoted at c to the axle-boxes and to bearings b, projecting from the brackets 1), form ed on said axle-boxes.

F F are rods secured to and depending from.

the pedestals a a. They pass through bearings 0 formed on the axle-boxes, and are provided with slotted ends ff, through which pass thelinks or pins 6, connecting said rods to the levers E. Y

The effect of the foregoing construction is as follows: As the car-body vertically vibrates the rods F F reciprocate in their bearings Z1 andoscillate'the levers E E to reciprocate the pistons. (Z d in the pumps 1). D, to condense or compress air therein, which air' is forcedthrough the valves g .in the pipes G to the tank H, secured tothe bottom of the cached y. The valvesg open toward the tank H, and as the pistons d (l descend said valves close to cut ofl' any back flow or pressure from said tank. As the car vibrates all the pumps are operated, and their combined results soon till tank H with air'condensed to several atmospheres, which can be nsed as a motive power for operating the ear-brakes of steam or streetrailway ears. x

The mechanism employed for operating the brakes dilfers but little from that heretofore used. In Fig. 2, I haveshown the same as applied to a street-car, wherein X is the brakingcylinder connected to tank H by pipe 1', having a two-way cock, '5, provided with a crank, '11, which is attached, by a rod, l, to a foot-treadle, K, or brake-wheel controlled by the driver of the car. 1

L L are the brakelevers, secured at one of their ends to the brake-rods M M, and at their other ends to the pivoted bar N, to which is also attached one end of the inane-cylinder piston-rod i as shown. a

To operate the brakes the treadle K is depressed, which, through medium of rod 1, moves crank i of valve e" to the position shown, thereby turning valve '1? to open communication from tank 11 to cylinder .i, the air pressure therefrom moving the piston of said cylinder in the direction of arrow :v-to move the bar N and levers L L, to cause the brake-shoes to impinge upon the wheels 0 U. Said shoes are held in such position as long as valve i remains open, as described.

On releasing the power or foot from treadle K the crank 2' under the influence ot' the reacting-spring Z, is returned to its normal position, thereby turning the valve t" to shut off the air-supply from tank ll, and opening a cured to said car and moves therewith.

' Fig. 5.

- with a given vibration of the car-body.

my improvements to steam railroad-cars the broadly, operating'car-brakes by passage through the exhaust-port i to the brake-cylinder for the escape of the contained air-pressure previously used for operating the brakes,'the spring at returning the piston to the opposite end of cylinder I, and thereby reversely moving the rod N to release the brake shoes fromthe wheels.

The pipes G Gr have flexible connections 9 q with the tank H, to accommodate said pipes to the vibration of the car as said tank is se- Figs. 4 and-5 show modifications of my invention, wherein the pumps are not designed to be attached directly to the mile-boxes, but to bars or rods springing therefrom, and are operated by means of the racks formed on the pedestals or hanging from the car-body andmeshing with intermediate gear mechanism, to either operate said pump-pistons by means of the toggle-levers, as shown in Fig. 4, or by the segmental gear and rack, as shown in The advantages of these modifications are thata more powerful compressor or pump may be used, and by the employment of multiplying-levers a greater length of stroke maybe obtained to condense a larger amount of air It is obvious that the detailed arrangement of the pumps or compressors and their operating mechanisms may be greatly variedwithin the spirit of my invention, and in applying pumpsmay, if desired, be secured to the equalizing-bars and the operating mechanisms to the truck-timbers, the result in either case being the same.

I do not wish to be understood as claiming, atmospheric pressure but my invention consists in' utilstant-ially as and for izing the vertical vibratory movement of a car-body to produce such pressure by means of suitably-interposed mechanism, and, in combination therewith, of braking mechanism.

What I claim as my invention is- 1. In combination with a spring-supported I car-body, an air compressor or pumpoperated by the vertical vibratory movement of said car-body to condense or compress air, subthe purpose set forth. 2. In combination with-a car-body having spring-supports, an air compressor or pump operated by the vertical vibratory movement of saidv car-body to compress air and force it into areservoir or tank, substantially as shown and set forth. v

3. In combination with a. car'body having spring-su 'iported pedestals, the axle-boxes having attached air pumping or compressing devices, and interposed mechanism whereby said pumps are operated by the vertical vi:

bratory movement of -said car-body, substans'tantially as shown and described. l

4. In combination with a"spring-s,upported car body or trnck,. the air compressing or pumping devices, and operating mechanism whereby said pumping brake-cylinder I, and braking mechanism,

substantially as and In testimony thathave hereunto set my April, A. D. 1880.

ISAAC. P..WENDELL.

for the purpose set-forth. I claim the foregoing I hand this 14th day of Witnesses G. B. RoBnR'rs, ALBERT LUPTon.

devices are worked by 'the vertical vibratory-movement .of said c'arand-the reservoir or tank and! brake" movement of '75 substantially as shown and de- 

